hi,

see there is various online learning sources available for ibps po or any other competitive exam, for exam byjus, testbook, grade up and so on. however the best way of studying is from books and practice on papers. in ibps po exam you have to solve questions from english, gk, quantitative and reasoning. so for each sections you must have the strategy of time management, makes answer faster but correct. so I suggest to follow the previous years papers and standard books to solve problems. I have mentioned some of the books name which may be helpful for studies of ibps po:

Reading Comprehension, Ordering of Sentences, Ordering of Words and Cloze Test by Dilip Khushwaha,

Quantitative Aptitude For Competitive Examinations by R.S Agarwal

The Pearson Guide to Quantitative Aptitude by Dinesh Khattar

A New Approach to Reasoning by B.S Sijwali and Indu Sijwali

Objective Computer Awareness by Arihant

India Year Book by Publications Division, Government of India